Facebook reports that it has 400 million active users worldwide. Make that 399,999,999. Laura LeNoir is done.

"I feel better, I feel lighter, I got my privacy back," says LeNoir, 42, an office manager at an educational software company in Birmingham, Ala., who logged off a few weeks ago. "People say, 'You'll be back.' But I read more, walk the dogs more. I'll be fine.